ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

4aSA11. Combined large area sensor---actuator tile for the NRL-ABC platform.

Robert D. Corsaro

Brian Houston

Naval Res. Lab., Code 7130, Washington, DC 20375-5350

A new research platform has been constructed for underwater studies of sensor/actuator coupling mechanisms. It consists of a 15-tile array of ``ABC'' tiles, where each tile contains a large area actuator, pressure sensor, and velocity sensor, where the latter is constructed by summing and integrating the outputs of four accelerometers. This paper presents details of the tile design and the predictive models used. Issues addressed include spatial sampling, near-field sensing, internal resonances, and both direct and extraneous coupling mechanisms, all of which can contribute to complicate the system transfer functions. Acoustic characteristics of the ABC tile were evaluated in the NRL Large Pool Facility, both in the free field and when mounted on a backing structure, and these results are compared with predictions. Implications for local control of the actuator's surface are also discussed.

All posters will be on display from 8:30 a.m. to 8:00 p.m. To allow contributors an opportunity to see other posters, contributors of odd-numbered papers will be at their posters from 8:30 to 10:15 a.m. and contributors of even-numbered papers will be at their posters from 10:15 a.m. to 12:00 noon.